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The change also means that the constants on which the new definitions rely — the charge of the electron for the ampere, Avogadro’s constant for the mole, Boltzmann’s constant for the kelvin and Planck’s constant for the kilogram — are from today fixed values with zero uncertainty.

Crucially, Avogadro’s constant and the Planck constant are intertwined in the laws of physics.

Having measured Avogadro’s constant, Dr. Bettin could derive the Planck constant.

One way to calculate Planck’s constant involves determining Avogadro’s constant, the number of particles in a given amount of a substance.

This allows them to calculate a value for Avogadro’s constant, which the researchers convert into a value for Planck’s constant.